A thermostatic property is defined as:

• A. A property that changes with temperature and pressure.
• B. A property that depends only on temperature.
• C. A property that depends only on salinity.
• D. A thermostatic property is a property that depends only on temperature.

Answer: (D)

Thermostatic properties are determined by temperature alone. That means the value of such a property changes when temperature changes, but remains unaffected by changes in pressure or salinity if temperature stays the same. So the best description is that a thermostatic property depends only on temperature. This sets it apart from properties that also depend on pressure or salinity.